5. The real George Steinbrenner filmed a scene for the Season 7 finale episode "The Invitations".

However, the scene had to be cut. Some say Steinbrenner was unhappy when he learned that Susan was to be killed off, while some say it was merely a time consideration. Footage still remains from the scene he filmed.

6. Lloyd Bridges, who played Izzy Mandelbaum for two episodes of the show, passed away less than six months after his second appearance aired.

13. Wayne Knight (Newman) credits Seinfeld for pushing him to take the first steps towards better health.

Knight experienced some heart palpitations while filming a scene for “The Bottle Deposit” in which he and Michael Richards had to run through a cornfield. He saw a doctor, who was very unhappy with Knight's health state. It was a huge wake-up call, and Knight began to take steps towards better health soon after.

14. The infamous “contest” episode is based on a real contest that Larry David and Kenny Kramer had.

15. Jerry only uses the computer in his apartment in two episodes.

16. Kenny Kramer tried to gain the Democratic Party nomination for New York City mayor in 1997.

Via Google Images

He was unsuccessful. His political website is still up, though. He also became an ordained minister with the non-denominational Universal Life Church in 2013. He hopes to take part in your wedding ceremony (for a nominal fee).

17. Sandy Baron, who played Jack Klompus on the show, was in a coma days before his last appearance on Seinfeld.

20. The real Soup Nazi, Al Yeganeh, hates the Nazi label and feels that his portrayal on Seinfeld “ruined his life” (even though it has given him fame and positive recognition to this day).

In a true showing of life imitating art, Jerry Seinfeld was banned from Al’s restaurant, Soup Kitchen International (now called “The Original Soup Man”), for allegedly giving Al “the most insincere, sarcastic apology ever” in regards to his usage of the Soup Nazi character.

21. Originally, the female character on the show was intended to be Claire, the waitress in the pilot episode.

24. Even Bill O’Reilley was a Seinfeld fan… until the end.

Here is a quote from O'Reilly's book A Bold Fresh Piece of Humanity: “After nine years of clever writing and brilliant comedic acting, Seinfeld’s closing act rivaled Petticoat Junction in witty payoff. So what the heck happened?… I think these guys tanked the final episode on purpose.”